Financial Instruments (Schedule of Carrying Amounts and Estimated Fair Values) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 6,038	$ 5,373
Carrying Amount \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt and current portion of long-term debt	39	20
Long-term debt	6,038	5,373
Carrying Amount \| Interest rate swaps and interest rate caps \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps and interest rate caps	1	12
Carrying Amount \| Vehicle-backed debt due to Avis Budget Rental Car Funding \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Vehicle-backed debt	4,386	3,441
Carrying Amount \| Avis Budget Rental Car Funding \| Vehicle-backed debt due to Avis Budget Rental Car Funding \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Vehicle-backed debt	15,527	14,083
Estimated Fair Value \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt and current portion of long-term debt	39	20
Long-term debt	6,168	5,452
Estimated Fair Value \| Interest rate swaps and interest rate caps \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps and interest rate caps	1	12
Estimated Fair Value \| Vehicle-backed debt due to Avis Budget Rental Car Funding \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Vehicle-backed debt	4,414	3,469
Estimated Fair Value \| Avis Budget Rental Car Funding \| Vehicle-backed debt due to Avis Budget Rental Car Funding \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Vehicle-backed debt	$ 15,709	$ 14,154

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